PERFORMANCE EVALUATION OF MOBILE STRAW BALER
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Performance evaluation of mobile straw baler 261
PERFORMANCE EVALUATION OF MOBILE
STRAW BALER
Muhammad Yasin*
ABSTRACT
Wheat bhoosa (chopped wheat straw) is an important component of stockfeed
in Pakistan. The improper storage conditions of bhoosa in mud plaster
structure adversely affect the quality. The transportation of bhoosa from field to
storage place is cumbersome and costly. The baling of bhoosa in the field
makes its handling and transportation much easier and cost effective with
minimum loss of the product. A power take off operated mobile straw baler was
developed at Agricultural Mechanization Research Institute, Multan, Pakistan
during the year to make bales of straw in the field. It can be operated by a 36.75
kW (50 hp) tractor, or a 14.7 kW (20 hp) diesel engine or a 14 kW electric motor.
It has the capacity to make a bale of 34.6 kg with an overall dimensions of 391 x
457.13 x 635 mm. It requires 4.3 minutes and 17 men-minutes to prepare one
bale. The baler can be used for other crop residues such as cotton sticks, corn
stover and sugarcane chuff. The baler has an outputs of 20, 16, 18 and 16 bales
per hour for bhoosa, cotton sticks, corn stovers and sugarcane chuff,
respectively. The capital cost of baler is Rs. 0.35 million with an operating cost
of Rs. 17, 10 and 38 when operated with diesel engine, electric motor and
tractor, respectively. Its commercial production has been started by a local
manufacturer.
KEYWORDS: Performance; balers; mobile; Pakistan.
INTRODUCTION
Wheat is one of major cereal crops of Pakistan covering an area of 21.4
million hectares during the year 2010 with a production of 19.20 million tons
(1). The straw (bhoosa) production is equivalent to that of grains. Due to
mixed crop-animal based farming system in Pakistan wheat straw is an
important component of stock feed. The wheat straw is primarily used for
stock feed, paper industry, packages and mud plaster for rural houses. It is
used as a major source of feed for approximately 28 million animals and is
mixed in various feeding materials i.e. green fodder, castor oil cake (khal),
animal feed (wanda), etc.(4).
*Director General Agriculture (Field), 21-Agha Khan-III Road, Lahore, Pakistan
J. Agric. Res., 2012, 50(2)
262 M. Yasin The wheat is harvested manually or with reaper and is threshed with thresher separating grains from chopped straw. The handling of bhoosa is a serious problem due to its low density. The farmers generally store the bhoosa in mud plaster covered heaps right in the field called “Dharh” or low cost structures made of different kinds of dried crop wastes called “Palla”. The bhoosa stored in Dharh or Palla is not safe as rain water can enter into the heap through cracks developed in mud plaster and spoils the bhoosa. Moreover, bhoosa is spoiled by rats, animal attacks and weather. The mud structure used to store bhoosa also occupies some portion of field which cannot be used for crop production. Moreover, application of irrigation water reduces the quality of bhoosa stored in Dharh and Palla (10). The bhoosa is used as animal feed. So its proper storage and handling is important to avoid its shortage during winter months. The inappropriate storage of bhoosa reduces its market value. Its transportation from field to storage area is laborious and costly. The overloading of bhoosa causes serious problem in travelling and sometimes accidents. The baling facility in the field helps save the bhoosa from weather calamities, makes handling and transportation easier, facilitates its easy and safe storage and maintains its quality. A baler is used to compress a cut and raked crop such as hay and straw into bales and bind them with twine. Round baler is frequently used. It produces cylindrically shaped ‘round’ or ‘roller’ bales. Early round balers were made by Allis Chalmers in 1947 as the rota baler. The baler made bales were roughly 406 mm in diameter and 1219 mm wide. The modern round baler was designed by Vermeer in 1972. The round bales made with this baler weighed upto one ton or more, and were well-suited to modern large scale dairy farm with 200 or more cows. It was power take-off operated and hay was manually fed. The biggest change to this type of baler occurred in 1940 when it was powered by the tractor, instead of a built-in internal combustion engine as reported by Curley et al.(2). Smith and Wilkes (8) mentioned that most of the field balers were pull type, self-propelled machines that produced rectangular bales varying in size i.e. 406 to 457 mm in width, 813 to 1067 mm in length and weighed from 18 to 40 kg. Self propelled models provided better visibility and maneuverability, but required higher annual use to justify their higher capital cost. The rectangular baler gained some popularity on small-scale, low-mechanization agriculture. Square and rectangular bales were generally better than round bales because a denser stack was put up. The automatic baler for small J. Agric. Res., 2012, 50(2)
Performance evaluation of mobile straw baler 263
square bales was first manufactured by the New Holland in 1940 which was
operated by a small petrol engine (9).
Smith et al. (7) described baler as a mechanical machine operated by a
tractor power take off or an engine incorporated within the baler. It physically
picked up the straw and placed it into a compression chamber. The straw in
the compression chamber was compressed by hydraulic ram. The hydraulic
2
pressure applied to a bale of straw varied from 136 to 170 kg/cm . Kepner et
al. (5) described that hay was handled from the field as bales and densities of
3
baled hay were generally varied from 130 to 225 kg/m and hay was simply
rolled up inside the baler with belt conveyors, fixed rollers, or a combination
of rollers and belts. The current models of conventional field balers were
automatic tieing machines with reciprocating plungers that produced bales
with rectangular cross section. Rectangular bales were easier to transport
than round bales since there was little risk of the bale rolling off the back of a
flatbed trailer. The rectangular shape also saved space and allowed a
complete solid slab of hay to be stacked up for transport (3).
The private sector in Pakistan have installed some stationary bhoosa baling
units on road side in different areas and are normally far from the field and
are comparatively lesser in number. The owners purchase bhoosa during
threshing season at cheaper rates and transport it to baling sites. It is
generally kept in open heap and later converted into bales and sold at higher
rates. These stationary balers cannot be hired by the farmers or dairy
owners. The purchase of bhoosa in bulk rather creates shortage in the
market. Moreover, the common farmers cannot install these balers at their
farms because of higher capital cost (10).
The stationary double cylinder straw balers are equipped with 50-80 hp
(36.75-58.83 kW) diesel engine. The gear/plunger pumps are used to make
bales of different sizes. The output of these balers varied from 45 to 55 bales
per hour with 9 to 15 labourers required to perform this operation. The weight
of straw bales ranged from 30 to 40 kg. The installation cost of baler ranged
from 0.35 to 0.5 million rupees. The cost of land where stationary baler was
installed ranged from Rs. 0.8 to 1.0 million. These balers were used for
baling of wheat straw for supplying to industrial sector like paper industry,
etc. as reported by Javed and Mughiz (4).
The availability of agricultural wastes/residues of major crops such as cotton
stalks, bhoosa, rice straw, rice husk, sugarcane stripping, corn stovers and
corn cobs pith were 5.49, 18.42, 3.64, 1.57, 4.02 and 0.068 million ton per
year, respectively. The purchase price varied from Rs. 2500/- to 3500/- per
J. Agric. Res., 2012, 50(2)264 M. Yasin
ton for bhoosa and Rs. 1200/- to 2000/- per ton for cotton stalks. The sale
prices of rice straw, rice rusk, corn stovers, corn cob pitch and sugarcane
stripping were approximately Rs. 2400, 5000, 1700, 5500 and 850 per ton,
respectively as reported by Naeem and Yasin (6).
The present paper reports the performance and attributes of a mobile straw
baler designed and developed to assist the farmers and dairy owners to bale
bhoosa and other crop residuess at their farms and store them safely for
stocks and other purposes.
MATERIALS AND METHODS
A mobile straw baler was designed and developed at Agricultural
Mechanization Research Institute (AMRI), Multan, Pakistan during the year
2003 and modified during 2004 (Fig. 1) in view of the field results and
farmers comments. In this study field performance of this baler was
evaluated during the year 2009. The design parameters of this mobile straw
baler were based on local farm size, crop wastes and field conditions. The
first prototype of mobile straw baler was fabricated at AMRI’s workshop in
2003 using locally available materials, fabrication techniques and facilities.
Some of important components and parts such as hydraulic pump, hydraulic
jack and gears were manufactured by the local industry according to their
technical specifications.
Fig. 1. Sketch of mobile straw baler.
J. Agric. Res., 2012, 50(2)Performance evaluation of mobile straw baler 265
The baler is mounted on a small trolley which can be transported to threshing
sites and bales are made right after threshing. It can be operated with a
tractor pto (power taker off) or 20 hp diesel engine or 14 kW electric motor.
The baler comprises a feeding hopper, a compressing chamber, a hydraulic
jack, a hydraulic pump, a gear box, main frame and power drive system (Fig.
2). The overall length, width and height of baler are 5300 mm, 1610 mm and
2060 mm, respectively. The main frame is 2530 mm long and 1075 mm wide
made from mild steel (M.S.) channel measuring 150 x 50 x 6 mm. The baling
chamber and gear box supports are also made of M.S. channel and welded
on main frame reinforced with brasses of M.S. plates.
Fig. 2. Mobile straw baler in operation in the field.
The hydraulic pump is driven by a gear box powered by a pto tractor shaft or
diesel engine or electric motor. The pump hosing contains control valve
assembly to operate hydraulic ram. A hydraulic pump with 36 plungers is
capable of producing a maximum pressure of 272 kg/cm2. The pump
chamber is mounted on M.S. channel welded to the main frame. The
pressure hose pipe of internal dia 19 mm and seamless pressure pipe of
outer dia 25 mm are used for hydraulic fluid.
The bale chamber is made of M.S. plate of size 10 mm and is 2050 mm long,
300 mm wide and 425 mm high. The bhoosa or straw falls from feeding
chute into the bale chamber and is held against the sliding compression plate
of jack for compression. Two side doors and one top door reinforced with
M.S. plates are fitted in the bale chamber. The appropriate door lock system
is provided to lock the chamber during compression stroke. The bale
chamber bottom plate is made of M.S. sheet of 18 mm thickness and
reinforced with a thicker M.S. plate.
J. Agric. Res., 2012, 50(2)266 M. Yasin
The feeding chute bolted at the top of compression chamber is used to feed
bhoosa or straw manually into the compression chamber. The hydraulic jack
of outer diameter 140 mm and 225 mm long compresses the bhoosa or straw
against the stationary compression plate and converts it into a proper bale
form.
RESULTS AND DISCUSSION
The mobile straw baler was tested in the field at different locations to make
bales of various crop wastes (Fig. 3). A team of four person was required to
operate, load straw, tie rope to bale and take out the bale from the chamber.
The straw bales made with this baler were easy to make denser stack to
weather better (Fig. 4). The baler is operated with 50 hp tractor or 20 hp
diesel engine or 14 kW electric motor.
Fig. 3. Straw bales in stock form.
The baler made bales of size approximately 391 x 457.13 x 635 mm. The
operation and handling of the bales was simple and easy. The loading and
transportation of bales with truck and trolley was easy and cheaper than that
of the straw (Fig. 5). The cost of baler is 3.5 to 4.0 lacs rupees. The average
3
weight and volume of bhoosa bale were 34.6 kg and 113498 cm ,
respectively. The baler took 4.3 minutes and consumed 17 men-minutes to
prepare a bale. The baler was tested on cotton sticks, corn stovers and
sugarcane chaff. Through output of baler for bhoosa, cotton sticks, corn
stovers and sugarcane chaff was 20, 16, 18 and 16 bales per hour,
respectively. The cost per bale was calculated as Rs. 17, 10 and 38 with
diesel engine, electric motor and tractor operation of baler, respectively. The
work performance of the baler was found satisfactory and appreciated by the
J. Agric. Res., 2012, 50(2)Performance evaluation of mobile straw baler 267
Fig. 4. Loading of straw bales on truck for transportation.
Fig. 5. Different crop residues/wastes bales prepared with
mobile straw baler
farmers. The prototype of baler was adopted by the local industries for its
mass production and promotion in the field.
Wheat straw (bhoosa)
The mobile baler was tested on wheat straw to make bales and data for ten
bales were recorded (Table 1). The average size of bhoosa bale was 391 x
457.13 x 635 mm. The average weight and volume of bale was 34.6 kg and
3
113498 cm , respectively. The baler took 4.3 minutes and required 17 men-
min to prepare a bale. The average output of baler was 20 bales per hour.
The cost per bale was calculated Rs. 17, 10 and 38 by operation of baler with
diesel engine, electric motor and 50 hp tractor, respectively (Table 2).
Table 1. Weight and volume of bhoosa bale alongwith bale making time of
mobile baler.
Volume of bale Time for bale Man-min @ 4
Weight of bale (kg) 3 men for
(cm ) making (minutes)
operation
35.0 110613 4.5 18
34.2 117987 3.5 14
34.4 115959 4.5 18
34.8 109261 4.4 18
34.5 111433 4.3 17
34.7 104468 4.5 18
35.0 120347 4.5 18
34.6 123690 4.3 17
34.3 107541 4.0 16
J. Agric. Res., 2012, 50(2)268 M. Yasin
34.5 113686 4.3 17
Avg. 34.6 113498 4.3 17
Table 2. Operational cost of mobile straw baler.
Capital cost (P) Rs. 35,0000/-
Annual use (AU) hr 2400
Total life in year (L) Year 10
Total life in hours (L) hr 24000
Salvage value @ 10% of P (S) Rs. 35000
Depreciation [(P–S) /L (hr)] Rs/hr 13.12
Interest @ 10% of AU [(P–S) / 2 x 0.1/AU] Rs/hr 8.02
Insurance, Shelter & Taxes @ 2% of [(P+S) / /AU] Rs/hr 1.6
Repair & maintenance @ 15% of P/L(hr) Rs/hr 2.18
Number of labours No. 4
Labour cost @ 6000 Rs/month/person (8 hrs per day) Rs/hr 100
Diesel engine @ 60 Rs / Petter (3 litre/hr) Rs. 180
Lubricant @ 15% of fuel cost Rs. 27
Electric motor 14 kW Rs/hr 84
Output bundles / hr Bundles/hr 20
Cost of operation with diesel Rs/hr 332
Cost of operation with electric motor Rs/hr 209
Cost of operation with rented tractor (@ 950 Rs/hr hiring rate) Rs/hr 1075
Cost of operation with own tractor (50 hp tractor) Rs/hr 766
(20 year life, AU = 500 hrs)
Cost of operation with diesel engine Rs/bundle 17
Cost of operation with electric motor Rs/bundle 10
Cost of operation with rented tractor Rs/bundle 54
Cost of operation with own tractor Rs/bundle 38
Other crop wastes
Performance of baler was also tested on other crop wastes such as cotton
sticks, corn stovers and sugarcane chuff (Table 3). The cotton sticks and
corn stovers bale size was 685.8 x 457.2 x 660.4 mm and 685.8 x 457.2 x
457.2 mm, respectively with average weight of 44.2 kg and 35.4 kg,
respectively. The average weight and volume of bales was calculated as 44.2
3 3
kg and 207068 cm for cotton sticks 35.4 kg and 143354 cm for corn
stovers, respectively. The shedding time for cotton sticks and corn stovers
was measured 9.7 and 6.3 minutes, respectively. The baling time for cotton
sticks and corn stovers was noted as 5.7 and 5.0 minutes, respectively. The
men-minutes required to make bales were estimated at 23 and 20 for cotton
sticks and corn stovers, respectively. The bale prepared from sugarcane
chaff was of 685.8 x 457.2 x 482.6 mm size. The weight and volume of bale
3
was calculated as 44.6 kg and 151319 cm with baling time of 12.3 minutes.
J. Agric. Res., 2012, 50(2)Performance evaluation of mobile straw baler 269
The output of baler for cotton sticks, corn stovers and sugarcane chaff was
determined as 16, 18 and 16, respectively.
Table 3. Baler performance for making bales of different crop wastes
Crop wastes Weight Shredding Time for Volume of Man-min @ 4
(kg) time bale making bale (cm3) men for
(minutes) (minutes) operation
45 9.2 5.4 207068 21.6
43 9.4 5.6 207068 22.4
Cotton sticks 45 10 6.3 207068 25.2
44 10.2 6 207068 24
44 9.6 5.5 207068 22
Average 44.2 9.68 5.76 207068 23.04
36 6 4.6 143354 18.4
36 5.6 4.8 143354 19.2
Corn Stovers 35 7 5 143354 20
35 6.5 5.2 143354 20.8
35 6.4 5.4 143354 21.6
Average 35.4 6.3 5 143354 20
34 0 12 151319 48
35 0 11.5 151319 46
Sugarcane
35 0 13 151319 52
Chaff/ Khori
35 0 12.5 151319 50
84 0 12.7 151319 50.8
Average 44.6 0 12.34 151319 49.36
CONCLUSION
This study concludes that mobile straw baler is helpful for farmers and dairy
owners in making bales of straw and bhoosa for easy handling,
transportation and safe storage. Overall, the baler performance was
satisfactory and appreciated by the farmers and dairy owners. Thus straw
baler was adopted by the local industry for its mass production and
promotion.
RECOMMENDATION
The performance and utlity of this mobile straw baler can be improved by
converting its horizontal compressing unit into vertical compressing unit
alongwith fitting of more efficient hydraulic pump having less plungers.
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th
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